Optical fiber cord and optical cord ribbon

Abstract

A mono-fiber type optical fiber cord comprising: a coated optical fiber which is an optical fiber with a fiber coat therearound, a synthetic resin coat having a substantially rectangular sectional surface for further covering the coated optical fiber, and a reinforcing member within the coat for coated optical fiber, wherein the reinforcing member is located along one of the shorter sides of the coat in the substantially parallel direction with the shorter sides in such a manner as to be embedded along the longitudinally extending direction of the coated optical fiber. An optical cord ribbon is formed by mutually bonding the longer sides of the adjacent substantially rectangular sectional surfaces of a plurality of the mono-fiber type optical fiber cords, and thereafter by coating the external surface of the thus aligned optical fiber cords by a bundling coating method.

What is claimed is:  
     
       1. An optical cord ribbon comprising: 
       a plurality of mono-fiber type optical fiber cords; and  
       a bundling coat for integrally coating said plurality of mono-fiber type optical fiber cords;  
       wherein each of said plurality of mono-fiber type optical fiber cords further comprises;  
       a coated optical fiber composed of an optical fiber and a fiber coat for covering said optical fiber;  
       a coat for covering said coated fiber, and having a substantially rectangular sectional surface; and  
       a reinforcing member within said coat for coated optical fiber, said reinforcing member being comprised of a plurality of strength rods,  
       wherein said plurality of strength rods are located along one of the shorter sides of said coat in the substantially parallel direction with said shorter sides in such a manner as to be embedded along the longitudinally extending direction of said coated optical fiber,  
       and said bundling coat is integrally coated on said plurality of mono-fiber type optical fiber cords, the longer sides of adjacent mono-fiber type fiber cords being abutted to each other, and each of said reinforcing members are aligned in a side-by-side manner.  
     
     
       2. An optical cord ribbon as claimed in claim  1 , wherein said plurality of strength rods are two rods which are located in a symmetrical relation with respect to the center axis of said optical fiber cord, in parallel with the longer sides thereof, and being in contact with said coated optical fiber. 
     
     
       3. An optical cord ribbon as claimed in claim  1 , wherein the sectional surface of each of said two strength rods is circular. 
     
     
       4. An optical cord ribbon as claimed in claim  1 , wherein the sectional surface of each of said two strength rods is substantially rectangular. 
     
     
       5. An optical cord ribbon as claimed in claim  1 , wherein the section surface of each of said two strength rods is elongate circular shape extending along said shorter side direction of said optical fiber cord. 
     
     
       6. An optical cord ribbon as claimed in claim  1 , wherein the sectional surface of each of said two strength rods is a substantially right-angled triangle, whose oblique side is located in the close proximity of the said coated optical fiber. 
     
     
       7. An optical cord ribbon as claimed in claim  1 , wherein the sectional surface of each of said two strength rods is a substantially pentagon having one side which is located in the close proximity of the said coated optical fiber. 
     
     
       8. An optical cord ribbon as claimed in claim  1 , wherein said plurality of strength rods are composed of one strength rod which is located on the center axis of said coat for coated optical fiber in parallel with the longer side thereof, and a pair of strength rods each having larger diameter than that of said one strength rod and located in a symmetric relation with respect to the center axis, sandwiching said one strength rod. 
     
     
       9. An optical cord ribbon as claimed in claim  1 , wherein said fiber cord further comprises a protection jacket coating therearound. 
     
     
       10. An optical cord ribbon as claimed in claim  9 , wherein said protection jacket is made of synthetic resin which is different from said coat for coated optical fiber.